The mitochondria are the site of aerobic respiration.
This has three stages:
This stage takes place in the cytoplasm [cytoplasm: The living substance inside a cell (not including the nucleus).] ; it does not require oxygen:
This stage takes place in the matrix of the mitochondrion and is the aerobic phase and requires oxygen:
Most of the energy produced during respiration is made by the cytochrome system. In this stage of aerobic respiration, the NADH2molecules [molecules: a collection of two or more atoms held together by chemical bonds. The fundamental unit of compounds] produced during glycolysis and the Krebs cycle transfer the hydrogens to the cytochrome system.
This is a system of hydrogen carriers located on the cristae of the mitochondrion and this stage also requires oxygen, which acts as the final hydrogen acceptor:
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